There is a clear difference between a private individual who wants to invest their own money, and a literal country who own the club for non-sporting reasons.
The Prime Minister is never going to be personally getting involved and arguing in favour of a single person and how they want to run their club. We've already seen this with Newcastle and their ownership and there's rumours that the government is putting pressure on regarding City.
That's getting off topic though, so to reiterate my original point, if Nas or Wes want to invest their own money, they should be able to as long as it is their money.
If they were to sign Mbappe on £500m a year for 3 year's and they put £1500m somewhere safe to pay for it then fantastic. If they signed him and then said that it's Villa's problem and bankrupted the club, that's not on. This is what FFP/PSR should be about.
Nswe clearly want to invest in the club and should be free to do so.